<html xmlns="http://www.w3.org/1999/xhtml">
<head>
</head>
<body>

<div>
  <select>
    <option style="margin: 100%;">A</option>
    <optgroup label="outgroup" style="padding: 10%;">
      <option style="padding: 10%;">M</option>
    </optgroup>
  </select>
</div>

</body>
</html>
